no 



13 (18) 



14 (15) 



15 (14) 



16(17) 



17 (16) 



18 (13) 



19 2i> 



Hind femora greatly thickened, often 

 flattened at the tip and bearing a 

 prominent denticulate plate below, 

 Merodon-like ; vertical triangle in 

 the male broad, frons in the i'emale 

 very broad. 



Third antennal joint red or reddish, 

 sometimes more or less infuscated, 

 but never black ; ocelli arranged in 

 an equilateral triangle. 



Abdomen more or less red on the 

 sides near the ba^e ; front coxae and 

 four anterior lej>s entirely red ; 

 wings hyaline with pale stigma . . 



Abdomen entirely black, or at the 

 most with yellow spots on the 

 second and third segments; front 

 coxae black; fore legs more or less 

 black ; wings infuscated towards 

 the middle, with blackish stigma. 



Abdomen with broad vellow spots on 

 the second and narrower ones on 

 the third segment; third antennal 

 joint small, dark brown 



Abdomen with the usual lunulae, 

 beneath which can be seen a yellow 

 ground ; legs often with black tarsi 

 also ; third antennal joint broad, 

 red 



axinecerus, Speis. 



f Macq. 



erythrocerua, Loew. 



20 (21) 

 21 (20) 

 22 (19) 



Third antennal joint entirely black; 



ocelli arranged in an isosceles tri- 

 angle, the anterior ocellus being 



further from the posterior ocelli 



than the latter are from each other. 

 Scutelium long, clothed with short 



hair, not ciliated behind, with the 



hind border thin, sharp, andgranular, 



not tomentose ; thorax shining 



black in front of the suture, without 



grey pattern ; frons in the female 



shining black ; abdomen elongate, 



with less distinct lunulae. 

 Eyes bare; hind femora and tibiaa 



'flattened, shining black, almost 



bare; third antennal joint tri- 

 angular triangularisj Ilerv.-P* 



Eyes densely pilose, even in the 



female ; hind femora and tibiae of 



usual shape, very hairy ; abdominal 



lunnlfB evanescent outwards unicolor, Loew. 



Scutelium rather short, clothed with 



long hair, ciliated behind, its hind 



border not sharp, less granular and 



grey tomentose ; thorax in front of 



the* suture with distinct grey mark- 

 ings ; frons in female densely 



tomentose, the ground-colour not 



